Pros:
The GoPro ecosystem is rich (a lot of available add-ons). You can easily change the batteries at the back (no need to remove the skeleton case).* You can add an external mic (although I don’t). The sound from the internal mic is reasonably good (see ). Lowest resolution is 720p (which takes less space; although other models have even lower resolution available).
*Not available in some more recent GoPro model
I bought this with a “Sports Accessory Kit Bundle (40+ PCS)” for 79.95 USD on Ebay.
h/t to Alton Sun for the suggestion.
If I had more money, I might buy a GoPro Fusion to film spherical videos.